#include"mystdio.h"
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<string.h>
#include<stdlib.h>
#include<unistd.h>

static MyFile* BuyFile(int fd,int flag)
{
    MyFile *f = (MyFile*)malloc(sizeof(MyFile));
    if(f==NULL) return NULL;
    f->bufferlen=0;
    f->fileno=fd;
    f->flag=flag;
    f->flush_method=LINE_FLUSH;
    memset(f->outbuffer,0,sizeof(f->outbuffer));
    return f;
}

MyFile* MyFopen(const char* path,const char* mode)
{
    int fd=-1;
    int flag=0;
    if(strcmp(mode,"w")==0)
    {
        flag=O_CREAT | O_WRONLY | O_TRUNC;
        fd=open(path,flag,0666);
    }
    else if(strcmp(mode,"a")==0)
    {
        flag=O_CREAT | O_WRONLY | O_APPEND;
        fd=open(path,flag,0666);
    }
    else if(strcmp(mode,"r")==0)
    {
        flag=O_RDWR;
        fd=open(path,flag,0666);
    }
    else
    {
        //
    }
    if(fd<0) return NULL;
    return BuyFile(fd,flag);
}


void MyFclose(MyFile *file)
{
    if(file->fileno<0) return;
    MyFFlush(file);
    close(file->fileno);
    free(file);
}
int MyFwrite(MyFile *file,void *str,int len)
{
    memcpy(file->outbuffer+file->bufferlen,str,len);
    file->bufferlen+=len;
    if((file->flush_method & LINE_FLUSH) && (file->outbuffer[file->bufferlen-1]=='\n'))
    {
        MyFFlush(file);
    }
    return 0;
}
void MyFFlush(MyFile *file)
{
    if(file->bufferlen<=0) return;
    int n=write(file->fileno,file->outbuffer,file->bufferlen);
    (void)n;
    file->bufferlen=0;

}
